Transformer Open and Short Circuit Test for the CBT Electrical Power PE Exam (Electrical PE Review)

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Learn how to solve transformer open and short circuit test problems for the new CBT format of the Electrical Power PE Exam by following a hands-on example taught by Zach Stone PE.

Video Table of Contents (Click the time stamp to advance):
0:00 - Problem introduction
2:21 - Open circuit voltage (Vo), power (Po), and current (Io)
3:54 - Open circuit power factor (θo)
5:00 - Solving for the core resistance current (Ic)
6:04 - Solving for the core resistance (Rc)
7:30 - Solving for the magnetizing core current (Im)
12:14 - Solving for the magnetizing reactance (Xm)
15:21 - Solving for the open circuit power (Po)
16:53 - Short circuit test basics and introduction
19:07 - Solving for the equivalent series winding resistance (Req)
21:26 - Solving for the magnitude of the series winding impedance |Zeq|
22:41 - Solving for the equivalent series leakage reactance (Xeq)
24:30 - Calculating transformer percent impedance (%Z) from the short circuit test

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Video Table of Contents (Click the time stamp to advance):
0:00 - Problem introduction
2:21 - Open circuit voltage (Vo), power (Po), and current (Io)
3:54 - Open circuit power factor (θo)
5:00 - Solving for the core resistance current (Ic)
6:04 - Solving for the core resistance (Rc)
7:30 - Solving for the magnetizing core current (Im)
12:14 - Solving for the magnetizing reactance (Xm)
15:21 - Solving for the open circuit power (Po)
16:53 - Short circuit test basics and introduction
19:07 - Solving for the equivalent series winding resistance (Req)
21:26 - Solving for the magnitude of the series winding impedance |Zeq|
22:41 - Solving for the equivalent series leakage reactance (Xeq)
24:30 - Calculating transformer percent impedance (%Z) from the short circuit test

Come learn why we are the fastest growing PE exam prep service provider for the new CBT format of the Electrical Power PE Exam at www.electricalpereview.com

electricalpereview
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You didn't refer the equivalent circuit to the primary as the problem stated.

wickedpawn
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do you need to apply the turns ratio to the current on the secondary side short circuit current to get I2 or is it the same?

aminulmizi
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Amazing Video!!Very helpful!
I sign up your class 2019 but did not take the exam, I plan to take the exam next month, wondering should I sign up the class again, is there going to be a lot of changes on the classes as it is CBT now?

binwenyan
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If an apparent power rating was supplied, why wouldn't you be able to change the impedance values already found into per unit to get %z? Or start by changing the SC current and voltage values into PU values then determine the %z from there. Shouldn't vpu/Ipu = zpu regardless of whether or not Ipu happens to equal 1 because its' at rated load?

jaymoseley